Electric heater



Patented Feb. v1, 192.7.`

UNITED STATES.

I1,615,950 PATENT OFFICE.

WILLIAM F. LONG, OF GRAND HAVEN, MICHIGAN, ASSIGNOR TO PEERLESS NOVELTY COMPANY, OF GRAND HAVEN, MICHIGAN, A CORPORATION -Olli MICHIGAN.

ELECTRIC HEATER.

Application led May 11, 1925. Serial No. 29.312.

This invention relates to an electric heating element which may be used in many places, such as in a device for heating curling or waving irons, electric toasters, small electric stoves and the like. The primary objectand purpose of the present invention is to provide a particularly effective electric heating element, one which can be made economically andwhich, it' any portion of it needs repair, can be readily reached for repair and the repairs easily made, In general the object ot' the invention is to' simplify and make more effect-ive electric heating elements of this character.

For an understanding of the invention reference may be had to the following description taken in connection with the accompanying drawing, in which,

Fig. 1 is a perspective view of the core of an electric heating element before the resistance coil is applied thereto.

Fig. 2 is a diagrammatic perspective view of the resistance coil in the form it takes when applied to the core, and

Fig. 3 is a horizontal section through the core shown in Fig. 1, the section being taken with the core inverted from the position shown in Fig. 1 and looking downwardly.

Like reference characters refer to like parts in the different' figures of the drawing.

The core of the heating element is rectang-v ular in cross section and includes spaced apart vertical sides 1 integrally connected by upper and lower horizontal sides 2, there being a continuous rectangular shaped opening 3 extending into the core nearly the full length thereof or until stopped by the partition 1a formed integral with said core.

This core is of any suitable insulating material, such as porcelain, and is integrally formed in one piece. At one end portions of the core are cut away to make the concaved recesses 4 in the sides 1, as shown. and against this end of the core a metal plate 5 is located, being permanently secured thereto by means of suitable angle bracketsI G which are attached to the core, and plate by any fastening means such as small bolts or screws. The plate 6 carries two binding posts 7 at the inner or core side thereof from which contacts 8 extend outwardly through the core for the detachable connection of an ""elec'tric cord used to make connection between electric devices of this character and a lamp or wall socket associated with a source of electric current supply.

In the outer vertical sides 1 of the Core spaced apart vertical grooves 9 are made and separated by `the ribs 10 which are left when the grooves are cut. The Sides of the core are slotted through at the bottom of the grooves 9 between the ends of said grooves as indicated at 11. Thevertical rib 10a. shown in Fig. 1, on one side oi the core and at the inner endl thereof terminates short of the upper side of the Core and is formed with a slightly under cut end as indicated at 12, the purpose of which will later appear. The upper and lower sides ot' the core are likewise formed withA ribs 13 lying between grooves or slots 14 but said ribs and slots extend diagonally across the core so that they join vertical ribs at opposite sides of the corenot in the same vertical plane. The upper and lower sides 2 are likewise slotted through making shorter slots 15. as best shown in Fig. 3. The end grooves 14'at the outer end of the core are continued as grooves 16 made at an angle to the vertical' in the sides 1 of the core in the direction of the binding posts-'7, one of said slots being shown in Fig. 1.-

The resistance wire of any wellr known form is applied to the core, a section 17 thereof lying in the slot or groove 16 andat its end being formed with a hook or loop so as to readily engage with one of the blnding posts 7. This wire is then carried through a groove 14-and thence downwardly through a vertical groove`9 across through a lower groove 14 and thepce upwardly in a vertical groove 9 at the opposite side of the core making the horizontal sections 19 and the vertical sections 2O of the resistance coil as shown in Fig. 2, this being continued until the upper end of the rib 10 is reached whereupon the resistance wire isy turned around the upper end of said rib 10a and under the overhang 12 and continued back in vertical and horizontal sections 22 and 23. respectively, in the grooves 9 and 14 until the outer end of the core is reached whereupon the wire is laid, in an upwardly and inwardly inclined section 24, in the slot 16 in the opposite side of the core and terminates\in a hoop 25 which is attached to the .opposite binding post 7.

, ous sections of the coil from each'bther.

or housing dependent which it is toI be used.

The heating element thus made, it is apparent, inherently in its construction holds the'parts of theV resistance coil of wire from any short circuiting or contact with each oth the ribs 10 and 13 of inupon vthe purpose for sulating materialcompletely separating andinsulating the various sections of the coil from each other, the wire being located in ythe grooves 9 and 14 below the outer surface slots 11 and 15 permit the` conduction ofheat given ofi' from the resistance coil to the opening 3 of the core in which articles which are to be heated may be inserted. This core is particularly practical and eective and has been used in connection with,

heating curling or waving irons which are placed lengthwise v of thecore within the opening 3. Itis however apparent that ,the construction i's notlimited tol this oneuse but may be utilizedl in a greatfmany-other places and relations. @Accordingly the invention is to be consideredl'not as limited in use'to, any specific article, but' as comprehensive of all forms of structure which come within the scope of `the appended claims defining the invention. r

I claim: A-

1. An' electric heating element comprising an elongated core of rectangular cross rib and woundsection formed at its vertical sides with vertical spaced apart ribs with grooves between the ribs and grooves 'oining the ribs and grooves of the vertical sldes of the core, one ofjthe vertical ribs at oneend of the core terminatingshort of the adjacent side of the core, a resistance coil doubled around the end of said last mentioned rib and wound in the grooves in the outer side of the core. the' various sections of the resist.- ance coil lying alongside each other being Aseparated and insulated from each other by said-ribs, a plate attached to the end of the core farthest distant from the said shortened vertical rib, and binding posts carried by said plate to which the ends ofthe resistancev coilare attached, substantially as described. f

2. An electric heating element comprising a core of insulating material formed with a series of'groovesand ribs around the same from one end to the other, said grooves and ribs being helically positioned and forming double threaded helical grooves and ribs around and lengthwise of the core` one of the end ribs in 'a side of the core being shortened at one end, aresistance coil doubled around said shortened end of said l round the core in the grooves Ithereof back toward the opposite end ,of the core, said core at said opposite end being formed with recessesin op osite sides thereof, a plate attached to sai end of the core and binding posts' carried by said plate to which the ends of the'resistscribed. A In testimony whereof I aiiix my signature.

.WILLIAM F. LGNG.

iance coil are secured, substantially as de 

